CYTSoft Psychrometric Calculator provides engineers and scientists with highly accurate thermodynamic properties of moist air at temperatures from -100 to 200 degrees Celsius, humidity ratios from 0 to 100000 kg/kg(a), and pressures from 1 Pa to 5 MPa. It calculates 41 properties completely based on the most exact formulations currently available - ASHRAE's Hyland-Wexler Formulations, which treat dry air, water vapor and moist air as real gases, rather than ideal gases.